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采用低压固体粉末包埋渗铝方法在M38镍基高温合金上制备钯改性铝化物涂层,利用热重分析(TGA)、扫描电镜(SEM)、X射线衍射(XRD)等方法,研究其1100℃的高温氧化行为,结果表明,(Ni,Pd)Al涂层的恒温氧化动力学近似符合抛物线氧化规律。与NiAl涂层相比,(Ni,Pd)Al涂层具有更优良的抗高温氧化性能,退化过程与NiAl涂层类似,添加改性元素Pd有利于稳定β相,延缓涂层的退化,有益于提高铝化物涂层的抗高温氧化性能。
Palladium-modified aluminide coating was prepared on M38 nickel-base superalloy by low-pressure solid-powder-embedded aluminizing method. The properties of the coating were investigated by means of TGA, SEM and XRD. 1100 ℃ high temperature oxidation behavior, the results show that (Ni, Pd) Al coating thermostatic oxidation kinetics approximates the parabolic oxidation law. Compared with NiAl coating, (Ni, Pd) Al coating has better high temperature oxidation resistance. The degradation process is similar to that of NiAl coating. Addition of Pd can stabilize the β phase and retard the degradation of the coating. To improve the high temperature oxidation resistance of aluminide coating.